<!DOCTYPE html>
<html lang="en" xmlns:th="https://www.thymeleaf.org/">
<head>
    <meta charset="UTF-8">
    <title>Hello</title>
    <script th:src="@{/webjars/jquery/3.2.1/dist/jquery.min.js}"></script>
    <script th:src="@{/webjars/bootstrap/4.3.1/js/bootstrap.min.js}">   </script>
    <link rel="stylesheet" th:href="@{/webjars/bootstrap/4.3.1/css/bootstrap.min.css}"/>
    <link type="text/css" rel="stylesheet" th:href="@{/static/css/style.css}">
</head>
<body>
<p>Hello !!!</p>
<h1>hello, thymeleaf</h1>
<img id="img1" alt="看到我说明图片挂了"
     th:src="@{/static/imgs/a.jpg}" title="帅哥一枚"
     width="10%" height="10%" class="rounded‐circle">
<button id="btn1" class="btn btn‐info">Click Me!</button>
<div id="div1"></div>
<form th:action="" method="post" enctype="multipart/form-data">
    文件：<input type="file" name="myFile">
    <input type="submit" value="上传">
</form>
</body>
<script type="text/javascript">
    $("#btn1").click(function(){
        $("#img1").attr({"src":"[[@{/}]]/static/imgs/b.jpg",
            "title":"小姐姐一名"});
        let val = $("#div1").html();
        if(val.length == 0)
            $("#div1").html("被点出来了...").css({"color":"silver", "font‐size": "24px"});
        else if(val != '')
            $("#div1").html("");
    });
</script>
</html>